Active Autowerke Catless Downpipes | BMW M235 335 435


SKU: 66395 Category:


BMW introduced a new Valvetronic single turbo version of its direct-injection engine for the F-Chassis models beginning in 2012. The Active Autowerke N55 downpipe for the M235i, 335i, 435i and M2 helps unleash some of the potential that is restricted by the OEM downpipe.

Turbochargers are powered by spent exhaust gases created during the combustion process. The quicker these gases are evacuated, the better. Unfortunately, the factory downpipe in the N55 is quite restrictive, which results in slower exhaust gases and slower turbo spool.

The Active Autowerke F-Chassis N55 Signature downpipe utilizes 3.5 diameter stainless steel piping in order to provide more power, quicker spool, and extreme durability.

Our F-Chassis N55 downpipe is one of a kind! We’ve fabricated a 3.5″ V-Band flange in the middle of it to create a truly modular design for any enthusiasts that would like to upgrade to a complete 3.5″ exhaust later down the road. The OEM downpipe shrinks down to under 3″ where it meets the stock exhaust. We’ve inserted our 3.5″ flange so that if you have an M2 you can later upgrade to our complete 3.5″ turbo-back system, or if you have an M235i, 335i or 435i you’ll have the option to create your own 3.5″ turbo-back system! Our downpipe is the perfect addition for any F-Chassis N55 and especially those with an upgraded turbo system!


The speed of a turbo’s impeller wheel is limited by exhaust backpressure. A larger downpipe relieves some of this pressure, resulting in a quicker and more efficient spool. With Active Autowerke’s Signature downpipe, your N55 can rev quicker, and deliver more horsepower and torque.

Minimizing backpressure while remaining daily drive-ability was the goal of our N55 downpipe. Owners can now upgrade to a product that is affordable, reliable, and easy to install. Note: Because this downpipe modifies the factory emissions system it is designed for off-road or racing use only.

After months of research and development, our engineers settled on a 3.5 diameter pipe which utilizes the least number of bends possible. However, the Signature N55 downpipe still fits easily into the OEM location, with a painless installation process.

Constructed entirely from 304 stainless steel with 1.5MM wall thickness, we are confident that you’ll be pleased with how robust and durable this downpipe is. Trouble-free installation and a long lifespan ensure that you’ll enjoy many miles of performance with your N55!


  • Designed to be as unrestrictive as possible
  • 3.50″ diameter piping allows for maximum power output
  • Quicker turbo spool
  • Easily bolts-on no cutting or welding required
  • Durable construction from 304 stainless steel
  • Precise fitment
  • Modular design for later upgrades


  • Fits all F-Chassis N55 cars from 09/2013 up only
  • Will trigger cel code unless tuned.

Additional information

Weight 10 lbs

Manufacturer Part Number


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Make Model Engine Year
BMW 135i N55 2011 - 2013
BMW 335i N55 2011 - 2013
BMW 335i N55 2012 - 2014
BMW 335i N55 2015
BMW M2 N55 2016 - 2017
BMW M2 N55 2018
BMW M235i N55 2014 - 2017